DK173949B1 - Locking system for lubricating oil for a centrifugal compressor bearings - Google Patents
Locking system for lubricating oil for a centrifugal compressor bearings Download PDFInfo
- Publication number
- DK173949B1 DK173949B1 DK199200443A DK44392A DK173949B1 DK 173949 B1 DK173949 B1 DK 173949B1 DK 199200443 A DK199200443 A DK 199200443A DK 44392 A DK44392 A DK 44392A DK 173949 B1 DK173949 B1 DK 173949B1
- Authority
- DK
- Denmark
- Prior art keywords
- compressor
- disc
- chamber
- bearing
- oil
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/08—Sealings
- F04D29/10—Shaft sealings
- F04D29/102—Shaft sealings especially adapted for elastic fluid pumps
- F04D29/104—Shaft sealings especially adapted for elastic fluid pumps the sealing fluid being other than the working fluid or being the working fluid treated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/44—Free-space packings
- F16J15/447—Labyrinth packings
- F16J15/4476—Labyrinth packings with radial path
Description
i DK 173949 B1in DK 173949 B1
Opfindelsen vedrører et spærresystem, der med små omkostninger og minimalt energiforbrug effektivt blokerer cirkulation af gas og oliedamp fra den tilhørende samlebeholder, gennem labyrinttætningen og mod 5 kompressorens sugeside, dvs. mod kompressorens første trins kompressorhjul, og således hindrer tab af olie, tillader at kompressoren med fordel kan anvendes i et lukket miljø, dvs. et miljø der ikke er i kontakt med atmosfæren, såsom ved havbunden, især når beholderen 10 som følge af pladsmangel må placeres meget tæt ved kompressoren.BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a barrier system which effectively blocks the circulation of gas and oil vapor from the associated collector vessel, through the maze seal and against the suction side of the compressor, at low cost and minimal energy consumption, i.e. against the compressor's first stage compressor wheel, thus preventing oil loss, allows the compressor to be advantageously used in a closed environment, ie. an environment not in contact with the atmosphere, such as at the seabed, especially when the container 10 due to lack of space must be placed very close to the compressor.
Mere specifikt vedrører opfindelsen en forbedring af spærresystemet beskrevet i IT patentansøgning nr. MI91 A 000210.More specifically, the invention relates to an improvement of the locking system described in IT patent application No. MI91 A 000210.
15 I det i nævnte patentansøgning beskrevne spærre system kompenseres den skadelige gasstrøm, der kunne opstå via den lukkede smøreoliesamlebeholder mellem le-jekammeret på kompressorens afgangsside, som er ved det højeste tryk, og lejekammeret på kompressorens sugesi-20 de, som er ved det laveste tryk, og kunne medrive oliedamp og -dråber gennem labyrinttætningen og mod det første trins kompressorhjul med påfølgende uacceptable smøreolietab, ved at indbefatte i afgangsrøret til sam-lebeholderen fra kammeret på kompressorens sugeside en 25 dynamisk spærring af væskeringstypen, som tillader smøreolien at passere ved tyngdekraftens hjælp, men som hindrer passage af gas eller damp i den modsatte retning. Mere specifikt består denne dynamiske spærring af en skive, som roterer inde i en torusformet statordel 30 med hvilken skiven danner en snæver passage, der altid forbliver fyldt med spærreolie som følge af den roterende skives centrifugalvirkning.In the locking system described in said patent application, the damaging gas flow that could occur through the closed lubricating oil container between the bearing chamber at the highest pressure outlet side and the bearing chamber at the lowest suction side of the compressor is compensated for. pressure, and could entrain oil vapor and droplets through the maze seal and toward the first stage compressor wheel with subsequent unacceptable lubricating oil losses, by including in the outlet pipe of the collector from the chamber on the compressor suction side a dynamic locking of the liquid ring type allowing the lubricating oil to pass through the aid, but which prevents the passage of gas or steam in the opposite direction. More specifically, this dynamic barrier consists of a disk rotating inside a torus-shaped stator portion 30 with which the disk forms a narrow passage which always remains filled with barrier oil due to the centrifugal action of the rotating disk.
Selvom denne løsning er særdeles effektiv som en spærring lider den af en række ulemper, såsom en kom-35 pleks opbygning og høj pris, som følge af behovet for en hjælpemotor til at drive skiven og et højt energi- DK 173949 B1 2 forbrug, fordi hele den oliemængde, der er nødvendig til at smøre lejet på kompressorens sugeside skal passere gennem passagen mellem den roterende skive og den torusformede statordel.Although this solution is extremely effective as a barrier, it suffers from a number of disadvantages, such as a complex construction and high cost, due to the need for an auxiliary motor to operate the disc and high energy consumption, because the entire amount of oil needed to lubricate the bearing on the suction side of the compressor must pass through the passage between the rotating disk and the torus-shaped stator portion.
5 Hensigten med opfindelsen er at eliminere disse ulemper ved at tilvejebringe et spærresystem, der ikke kræver en motor, og som blot benytter en minimal spærreoliemængde.The object of the invention is to eliminate these disadvantages by providing a locking system which does not require a motor and which simply uses a minimal amount of barrier oil.
Dette opnås ved ikke at placere spærringen i af-1 o gangsrøret fra kammeret på kompressorens sugeside til beholderen, men i selve kammeret, mellem lejet og labyrinttætningen på sugesiden, og ved at udforme spærresystemet med en skive, der er drejefast og koncentrisk med kompressorens rotationsaksel, og som har en om-15 vendt, U-formet rand, der huser en statorring, der er stift forbundet med væggen af lejekammeret på sugesiden og som er koncentrisk med kompressorakslen, med hvilken statorring skiven danner en snæver passage, der kontinuerligt tilføres olie med spærretryk gennem kalibrere-20 de huller i ringen.This is accomplished by not placing the barrier in the outlet pipe from the chamber on the suction side of the compressor to the container, but in the chamber itself, between the bearing and the labyrinth seal on the suction side, and by designing the locking system with a rotary and concentric disc with the rotary shaft of the compressor. and having an inverted U-shaped rim housing a stator ring rigidly connected to the wall of the suction side bearing chamber and concentric with the compressor shaft with which the stator ring disc forms a narrow passage which is continuously applied to oil with blocking pressure through calibrated holes in the ring.
Tilstedeværelsen af den snævre passage der er udsat for centrifugalkraften som følge af rotationen af skiven, der er drejefast med akslen, hvilket sikrer at passagen altid holdes fyldt med spærreolie, bevirker at 25 lejekammeret på kompressorens sugeside adskilles effektivt fra labyrinttætningszonen på kompressorens sugeside og hindrer således enhver cirkulation af gas og smøreoliedamp fra kammeret til kompressorens første trins kompressorhjul. Som følge heraf hindres tab af smøre-30 olie, selv om trykket i kammeret, fordi kompressoren er placeret i et lukket miljø, er højere end trykket i området ved det første kompressorhjul, fordi kammeret på kendt måde er forbundet til lej ekammeret på kompressorens afgangsside via afgangsrørene og toppen af den 35 lukkede samlebeholder.The presence of the narrow passage exposed to the centrifugal force due to the rotation of the disc rotatably with the shaft, ensuring that the passage is always filled with barrier oil, effectively separates the bearing chamber on the suction side of the compressor from the labyrinth sealing zone on the suction side of the compressor. any gas and lubricant vapor circulation from the chamber to the first stage compressor wheel of the compressor. As a result, loss of lubricating oil is prevented, although the pressure in the chamber, because the compressor is located in a closed environment, is higher than the pressure in the area of the first compressor wheel, because the chamber is known in a known way to the bearing chamber on the outlet side of the compressor. via the discharge pipes and the top of the 35 closed collector.
Den nødvendige spærreoliestrøm gennem passagen er nu blot det minimum, der kræves for at hindre over- DK 173949 B1 3 opvarmning af passagen forårsaget af viskositeten af olien, der bevæges af den roterende skive. For at hindre uønsket tab af spærreolie og således holde den krævede oliestrøm lille, har statorringen ifølge en yder-5 ligere udførelsesform på den side der vender mod skiven en kile, som går ind i et korresponderende hulrum i skiven, og en ringformet deflektortand, der springer frem udover yderkanten af hulrummet i skiven. På denne måde skabes en slags labyrint som hindrer spærreolien i 1 o at strømme ind i mellemrummet mellem akslen og stator-ringen.The required barrier oil flow through the passage is now just the minimum required to prevent overheating of the passage caused by the viscosity of the oil moving by the rotating disk. In order to prevent unwanted loss of barrier oil and thus keep the required oil flow small, the stator ring according to a further embodiment on the side facing the disc has a wedge which enters a corresponding cavity in the disc and an annular deflector tooth which projecting beyond the outer edge of the cavity of the disc. In this way, a kind of maze is created which prevents the barrier oil from flowing into the gap between the shaft and the stator ring.
Med opfindelsen tilvejebringes et spærresysten for smøreolie til en centrifugalkompressors lejer med labyrinttætninger, hvilken centrifugalkompressor er in-15 stalleret i et lukket miljø og omfatter én eller flere kompressorhjul monteret på en aksel, der roterer med høj hastighed i lejerne, og en pumpe, der tager smøreolien for lejerne fra en lukket samlebeholder og tilfører den under tryk til henholdsvis et kammer, der ven-20 der mod lejet placeret på kompressorens sugeside, opstrøms for sugeside-labyrinttætningen, og et kammer, der vender mod lejet placeret på kompressorens afgangsside, nedstrøms for afgangsside-labyrinttætningen, hvorfra olien ved hjælp af tyngdekraften føres gennem 25 separate rør, der forbinder de respektive kamre med toppen af den lukkede samlebeholder, hvilket spærresystem er ejendommeligt ved, at der i kammeret vendende mod lejet på kompressorens sugeside, i en position mellem lejet og sugeside-labyrinttætningen, koncentrisk 30 med og drejefast med kompressorakslen, er en skive med en omvendt, U-formet rand, der huser en statorring, der er stift forbundet med kammerets væg og er koncentrisk med akslen, med hvilken statorring skiven danner en snæver passage, der kontinuerligt tilføres spærreolie 35 gennem kalibrerede huller i ringen, og som af centrifugalvirkningen af den roterende skive holdes fyldt med DK 173949 B1 4 spærreolie afledt fra røret gennem hvilket smøreolie tilføres under tryk til kammeret, hvilken statorring, på den side, der vender mod skiven har en kile, som går ind i et korresponderende hulrum i skiven og en ring-5 formet reflektortand, der springer frem udover yderkanten af hulrummet i skiven.The invention provides a lubricating oil barrier system for a maze sealing centrifugal compressor bearing, which is installed in a closed environment and comprises one or more compressor wheels mounted on a high speed rotary shaft bearing and a pump which takes the lubricating oil for the bearings from a closed collector tank and applying it under pressure to a chamber facing the bearing located on the suction side of the compressor, upstream of the suction side maze seal, and a chamber facing the bearing located on the outlet side of the compressor, downstream of the the exit-side labyrinth seal from which the oil, by gravity, is passed through 25 separate tubes connecting the respective chambers to the top of the closed collecting vessel, which locking system is characterized in that in the chamber facing the bearing on the compressor suction side, in a position between the bearing and the suction side labyrinth seal, concentric with and turning fixed to the compressor shaft is a disc with an inverted U-shaped rim housing a stator ring rigidly connected to the chamber wall and concentric to the shaft with which the stator ring disc forms a narrow passage which is continuously applied to barrier oil 35 through calibrated holes in the ring and which are filled by the centrifugal action of the rotating disk with DK 173949 B1 4 barrier oil derived from the pipe through which lubricating oil is applied under pressure to the chamber, which stator ring, on the side facing the disk has a wedge which enters. in a corresponding cavity in the disc and an annular reflector tooth protruding beyond the outer edge of the cavity in the disc.
Opfindelsen vil nu blive nærmere forklaret ved hjælp af en udførelsesform og med henvisning til tegningen, på hvilken 10 fig. 1 er et sidebillede i delvis snit af en centrifugalkompressor med labyrinttætninger og med et spærresystem ifølge opfindelsen, og fig. 2 et sidebillede i delvis snit af en detalje af fig. l, visende spærresystemet i stor målestok.The invention will now be further explained by way of an embodiment and with reference to the drawing, in which: FIG. 1 is a partial cross-sectional side view of a labyrinth sealing centrifugal compressor and with a blocking system according to the invention; and FIG. 2 is a partial sectional side view of a detail of FIG. 1, showing the locking system on a large scale.
75 På tegningen er vist en centrifugalkompressor 1 i hvilken procesgassen, der strømmer ind gennem sugekanalen 2 og strømmer ud gennem afgangskanalen 3, kom-primeres ved hjælp af skovlbladene på et kompressorhjul 4, monteret på en aksel 5, der roteres med høj hastig-20 hed ved hjælp af en motor 6 i lejer 7 og Θ, placeret henholdsvis på sugesiden og tryksiden af kompressorens l's kompressions zone, der afgrænses ved hjælp af labyrinttætninger henholdsvis 9 og 10. Fig. 1 viser også en kanal li ved hjælp af hvilken kompressorens suge-25 tryk overføres til kammeret 12 nedstrøms for kompressorhjulet 4.75 The drawing shows a centrifugal compressor 1 in which the process gas flowing in through the suction duct 2 and flowing through the exhaust duct 3 is compressed by means of the vane blades on a compressor wheel 4 mounted on a shaft 5 which rotates at high speed. Figs. 1 are provided by means of a motor 6 in bearings 7 and Θ, respectively located on the suction side and the pressure side of the compression zone of compressor 1, which is defined by maze seals 9 and 10 respectively. 1 also shows a channel 1 by which the suction pressure of the compressor is transferred to the chamber 12 downstream of the compressor wheel 4.
Lejerne 7 og 8 smøres kontinuerligt af smøreolie 13, indeholdt i en lukket samlebeholder 14, hvorfra den suges ved hjælp af en pumpe 15, der via 30 rør 16 og 17 leder den henholdsvis til et kammer 18, der vender mod lejet 8 placeret på kompressorens afgangsside, og til et kammer 19, der vender mod lejet 7 placeret på kompressorens sugeside. Olien strømmer derefter ud af kamrene 18 og 19 ved tyngdekraftens 35 hjælp og gennem separate rør henholdsvis 20 og 21, som forbinder kamrene til toppen 22 af den lukkede beholder 14.The bearings 7 and 8 are continuously lubricated by lubricating oil 13 contained in a closed collecting vessel 14 from which it is sucked by a pump 15 which, via 30 pipes 16 and 17, directs it respectively to a chamber 18 facing the bed 8 located on the compressor outlet side, and to a chamber 19 facing the bearing 7 located on the suction side of the compressor. The oil then flows out of the chambers 18 and 19 at the aid of gravity 35 and through separate pipes 20 and 21, respectively, which connect the chambers to the top 22 of the closed container 14.
DK 173949 B1 5DK 173949 B1 5
Det dynamiske spærresystem 23 ifølge opfindelsen er placeret i kammeret 19 mellem lejet 7 og labyrinttætningen 9. Spærresystemet 2 3 består af en skive 24, der er drejefast med og koncentrisk placeret 5 på kompressoren l's aksel 5, hvilken skive har en omvendt, U-formet rand 25, i hvilken der er indsat en statorring 26, der er stift forbundet med væggen 27 i kammeret 19 og som er anbragt koncentrisk med akslen 5.The dynamic locking system 23 according to the invention is located in the chamber 19 between the bearing 7 and the labyrinth seal 9. The locking system 23 consists of a disc 24 which is rotatably fixed and concentrically located 5 on the shaft 5 of the compressor 1, which has an inverted, U-shaped rim 25, into which is inserted a stator ring 26 which is rigidly connected to the wall 27 of the chamber 19 and which is concentrically arranged with the shaft 5.
10 Statorringen 26 danner således med den rote rende skive 24 en snæver passage 28, der kontinuerligt tilføres spærreolie, afledt fra røret 17 via en gren 31 i retning af pilene 29, gennem kalibrerede huller 30.Thus, with the rotating annular disc 24, the stator ring 26 forms a narrow passage 28 which is continuously supplied with barrier oil, derived from the tube 17 via a branch 31 in the direction of the arrows 29, through calibrated holes 30.
15 Statorringen 26 har yderligere på siden, der vender mod den roterende skive 24 en kile 32, som går ind i et korresponderende hulrum 33 udformet i den roterende skive 24, samt en ringformet deflektor-tand 34, som rager ud over og derfor går forbi den 20 ydre ringkant 35 af hulrummet 33.The stator ring 26 further has on the side facing the rotating disc 24 a wedge 32 which enters a corresponding cavity 33 formed in the rotating disc 24, as well as an annular deflector tooth 34 which protrudes beyond and therefore passes the 20 outer ring edge 35 of the cavity 33.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI910991A IT1248296B (en) | 1991-04-11 | 1991-04-11 | IMPROVEMENT OF THE CUSHION LUBRICATION OIL BARRING SYSTEM OF A CENTRIFUGAL COMPRESSOR WITH LABYRINTH SEALS INSTALLED IN A CONFINED ENVIRONMENT |
| ITMI910991 | 1991-04-11 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DK44392D0 DK44392D0 (en) | 1992-04-02 |
| DK44392A DK44392A (en) | 1992-10-12 |
| DK173949B1 true DK173949B1 (en) | 2002-03-04 |
Family
ID=11359531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DK199200443A DK173949B1 (en) | 1991-04-11 | 1992-04-02 | Locking system for lubricating oil for a centrifugal compressor bearings |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US5207291A (en) |
| JP (1) | JP3122908B2 (en) |
| DE (1) | DE4212169C2 (en) |
| DK (1) | DK173949B1 (en) |
| FR (1) | FR2675213B1 (en) |
| GB (1) | GB2254664B (en) |
| IT (1) | IT1248296B (en) |
| MX (1) | MX9201629A (en) |
| NL (1) | NL192578C (en) |
| NO (1) | NO175877B1 (en) |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5967524A (en) * | 1993-05-21 | 1999-10-19 | Jm Clipper Corporation | Hybrid seal device |
| US6017037A (en) * | 1993-05-21 | 2000-01-25 | J.M. Clipper Corporation | Seal device |
| US6065755A (en) * | 1993-05-21 | 2000-05-23 | Jm Clipper Corporation | Seal device |
| KR100388125B1 (en) * | 2000-12-21 | 2003-06-19 | 위니아만도 주식회사 | Oil supply apparatus of centrifugal compression freezer |
| JP4747437B2 (en) * | 2001-05-08 | 2011-08-17 | 株式会社豊田自動織機 | Oil leakage prevention structure in vacuum pump |
| US6640933B2 (en) | 2001-07-10 | 2003-11-04 | Rolls Royce Corporation | Lubrication system for a bearing |
| DE10163950A1 (en) * | 2001-12-22 | 2003-07-03 | Miscel Oy Ltd | Flow machine unit has cooling lubricant supplied to bearing set for common shaft positioned between rotor of electric motor and blade wheel housing |
| WO2007035699A2 (en) * | 2005-09-19 | 2007-03-29 | Ingersoll-Rand Company | Impeller for a centrifugal compressor |
| CN101297118B (en) * | 2005-09-19 | 2011-09-28 | 英格索尔-兰德公司 | Stationary seal ring for a centrifugal compressor |
| WO2007035698A2 (en) * | 2005-09-19 | 2007-03-29 | Ingersoll-Rand Company | Centrifugal compressor including a seal system |
| NO324811B1 (en) * | 2005-12-22 | 2007-12-10 | Norsk Hydro Produksjon As | underwater Pump |
| NO325803B1 (en) * | 2006-10-13 | 2008-07-21 | Framo Eng As | Sealing system device |
| GB2448184B (en) * | 2007-04-05 | 2012-04-18 | Totton Pumps Ltd | A motor protection device |
| NO328277B1 (en) | 2008-04-21 | 2010-01-18 | Statoil Asa | Gas Compression System |
| TWI386611B (en) * | 2010-02-10 | 2013-02-21 | Ind Tech Res Inst | Oil free lubrication centrifugal refrigerant compressor and lubrication method thereof |
| US20130136634A1 (en) * | 2010-06-22 | 2013-05-30 | Vetco Gray Scandinavia As | Motor and pump barrier fluids pressure regulation system in a subsea motor and pump module |
| CA2963230A1 (en) * | 2010-06-28 | 2012-01-05 | Noda Kanagata Co., Ltd. | Elbow formed by cutting and method for manufacturing same |
| NO333684B1 (en) * | 2011-03-07 | 2013-08-12 | Aker Subsea As | UNDERWATER PRESSURE COOKING MACHINE |
| RU2554677C1 (en) * | 2014-02-19 | 2015-06-27 | Публичное акционерное общество "Научно-производственное объединение "Искра" (ПАО "НПО "Искра") | System of compressor shaft seals |
| CN107110172B (en) * | 2014-10-31 | 2020-09-04 | 特灵国际有限公司 | System and method for providing lubricant to a bearing |
| JP6617992B2 (en) * | 2016-06-10 | 2019-12-11 | 三菱重工コンプレッサ株式会社 | Compressor module |
| RU178144U1 (en) * | 2017-06-07 | 2018-03-26 | Акционерное общество "Научно-исследовательский и конструкторский институт центробежных и роторных компрессоров им. В.Б. Шнеппа" | Centrifugal compressor rotor shaft seal assembly |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE195490C (en) * | ||||
| US1413425A (en) * | 1919-08-06 | 1922-04-18 | Gen Electric | Shaft bearing |
| GB268100A (en) * | 1926-02-17 | 1927-03-31 | Charles Arthur Smith | Improvements in or relating to sliding windows or the like |
| US2133879A (en) * | 1936-04-28 | 1938-10-18 | Gen Electric | Shaft packing |
| FR946424A (en) * | 1946-05-15 | 1949-06-02 | Westinghouse Electric Corp | Gas compressor |
| US2711332A (en) * | 1953-09-15 | 1955-06-21 | Alsacienne Constr Meca | Fluid seal |
| US2823052A (en) * | 1954-04-12 | 1958-02-11 | Gen Motors Corp | Fluid seal device |
| US3685617A (en) * | 1971-01-06 | 1972-08-22 | Borg Warner | Bearing and lubrication means |
| US3765688A (en) * | 1971-07-19 | 1973-10-16 | Avco Corp | High speed shaft centrifuge fluid seal |
| US4265456A (en) * | 1979-06-07 | 1981-05-05 | Holset Engineering Company Limited | Sealing assembly |
| US4335885A (en) * | 1980-08-19 | 1982-06-22 | Mechanical Technology Incorporated | Plural fluid magnetic/centrifugal seal |
| US4477223A (en) * | 1982-06-11 | 1984-10-16 | Texas Turbine, Inc. | Sealing system for a turboexpander compressor |
| US4455026A (en) * | 1982-12-07 | 1984-06-19 | Mechanical Technology Incorporated | Vee-shaped magnetic/centrifugal seal and method of operation |
-
1991
- 1991-04-11 IT ITMI910991A patent/IT1248296B/en active IP Right Grant
-
1992
- 1992-04-01 NO NO19921263A patent/NO175877B1/en not_active IP Right Cessation
- 1992-04-02 DK DK199200443A patent/DK173949B1/en not_active IP Right Cessation
- 1992-04-02 US US07/862,229 patent/US5207291A/en not_active Expired - Lifetime
- 1992-04-03 GB GB9208078A patent/GB2254664B/en not_active Expired - Lifetime
- 1992-04-07 FR FR9204209A patent/FR2675213B1/en not_active Expired - Lifetime
- 1992-04-09 MX MX9201629A patent/MX9201629A/en not_active IP Right Cessation
- 1992-04-09 JP JP04115188A patent/JP3122908B2/en not_active Expired - Lifetime
- 1992-04-10 DE DE4212169A patent/DE4212169C2/en not_active Expired - Lifetime
- 1992-04-10 NL NL9200671A patent/NL192578C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FR2675213B1 (en) | 1993-07-30 |
| JPH05133390A (en) | 1993-05-28 |
| ITMI910991A0 (en) | 1991-04-11 |
| FR2675213A1 (en) | 1992-10-16 |
| DE4212169A1 (en) | 1992-10-15 |
| NL9200671A (en) | 1992-11-02 |
| GB2254664A (en) | 1992-10-14 |
| NO175877B (en) | 1994-09-12 |
| GB2254664B (en) | 1995-01-11 |
| JP3122908B2 (en) | 2001-01-09 |
| DE4212169C2 (en) | 1993-12-16 |
| GB9208078D0 (en) | 1992-05-27 |
| NO921263A (en) | 1992-10-12 |
| ITMI910991A1 (en) | 1992-10-11 |
| NL192578C (en) | 1997-10-03 |
| IT1248296B (en) | 1995-01-05 |
| NL192578B (en) | 1997-06-02 |
| DK44392A (en) | 1992-10-12 |
| NO175877B1 (en) | 1995-01-09 |
| DK44392D0 (en) | 1992-04-02 |
| NO921263D0 (en) | 1992-04-01 |
| NO175877C (en) | 1994-12-21 |
| MX9201629A (en) | 1992-10-01 |
| US5207291A (en) | 1993-05-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| B1 | Patent granted (law 1993) | ||
| PBP | Patent lapsed |
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